Finding the Fourth Proportional to 9,271.07, 12,799.89 and 7,142.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,271.07 : 12,799.89 = 7,142.59 : x
2. Step 2: Convert to fraction form
   9,271.07/12,799.89 = 7,142.59/x
3. Step 3: Cross multiply
   9,271.07x = 12,799.89 × 7,142.59
4. Step 4: Simplify right side
   9,271.07x = 91,424,366.32
5. Step 5: Solve for x
   x = 91,424,366.32/9,271.07
6. Step 6: Final answer
   x = 9,861.25